CLK: clk-twl6040: Initial clock driver for OMAP4+ McPDM fclk clock (f9f8c043) · Commits · 戴 / test

drivers/clk/Kconfig

+8 −0

Original line number	Diff line number	Diff line
		@@ -53,4 +53,12 @@ config COMMON_CLK_MAX77686
		---help---
		This driver supports Maxim 77686 crystal oscillator clock.

		config CLK_TWL6040
		tristate "External McPDM functional clock from twl6040"
		depends on TWL6040_CORE
		---help---
		Enable the external functional clock support on OMAP4+ platforms for
		McPDM. McPDM module is using the external bit clock on the McPDM bus
		as functional clock.

		endmenu

drivers/clk/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -23,3 +23,4 @@ obj-$(CONFIG_ARCH_VT8500) += clk-vt8500.o
		# Chip specific
		obj-$(CONFIG_COMMON_CLK_WM831X) += clk-wm831x.o
		obj-$(CONFIG_COMMON_CLK_MAX77686) += clk-max77686.o
		obj-$(CONFIG_CLK_TWL6040) += clk-twl6040.o

drivers/clk/clk-twl6040.c

0 → 100644

+126 −0

Original line number	Diff line number	Diff line
		/*
		* TWL6040 clock module driver for OMAP4 McPDM functional clock
		*
		* Copyright (C) 2012 Texas Instruments Inc.
		* Peter Ujfalusi <peter.ujfalusi@ti.com>
		*
		* This program is free software; you can redistribute it and/or
		* modify it under the terms of the GNU General Public License
		* version 2 as published by the Free Software Foundation.
		*
		* This program is distributed in the hope that it will be useful, but
		* WITHOUT ANY WARRANTY; without even the implied warranty of
		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
		* General Public License for more details.
		*
		* You should have received a copy of the GNU General Public License
		* along with this program; if not, write to the Free Software
		* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
		* 02110-1301 USA
		*
		*/

		#include <linux/clk.h>
		#include <linux/module.h>
		#include <linux/slab.h>
		#include <linux/platform_device.h>
		#include <linux/mfd/twl6040.h>
		#include <linux/clk-provider.h>

		struct twl6040_clk {
		struct twl6040 *twl6040;
		struct device *dev;
		struct clk_hw mcpdm_fclk;
		struct clk *clk;
		int enabled;
		};

		static int twl6040_bitclk_is_enabled(struct clk_hw *hw)
		{
		struct twl6040_clk *twl6040_clk = container_of(hw, struct twl6040_clk,
		mcpdm_fclk);
		return twl6040_clk->enabled;
		}

		static int twl6040_bitclk_prepare(struct clk_hw *hw)
		{
		struct twl6040_clk *twl6040_clk = container_of(hw, struct twl6040_clk,
		mcpdm_fclk);
		int ret;

		ret = twl6040_power(twl6040_clk->twl6040, 1);
		if (!ret)
		twl6040_clk->enabled = 1;

		return ret;
		}

		static void twl6040_bitclk_unprepare(struct clk_hw *hw)
		{
		struct twl6040_clk *twl6040_clk = container_of(hw, struct twl6040_clk,
		mcpdm_fclk);
		int ret;

		ret = twl6040_power(twl6040_clk->twl6040, 0);
		if (!ret)
		twl6040_clk->enabled = 0;
		}

		static const struct clk_ops twl6040_mcpdm_ops = {
		.is_enabled = twl6040_bitclk_is_enabled,
		.prepare = twl6040_bitclk_prepare,
		.unprepare = twl6040_bitclk_unprepare,
		};

		static struct clk_init_data wm831x_clkout_init = {
		.name = "mcpdm_fclk",
		.ops = &twl6040_mcpdm_ops,
		.flags = CLK_IS_ROOT,
		};

		static int __devinit twl6040_clk_probe(struct platform_device *pdev)
		{
		struct twl6040 *twl6040 = dev_get_drvdata(pdev->dev.parent);
		struct twl6040_clk *clkdata;

		clkdata = devm_kzalloc(&pdev->dev, sizeof(*clkdata), GFP_KERNEL);
		if (!clkdata)
		return -ENOMEM;

		clkdata->dev = &pdev->dev;
		clkdata->twl6040 = twl6040;

		clkdata->mcpdm_fclk.init = &wm831x_clkout_init;
		clkdata->clk = clk_register(&pdev->dev, &clkdata->mcpdm_fclk);
		if (!clkdata->clk)
		return -EINVAL;

		dev_set_drvdata(&pdev->dev, clkdata);

		return 0;
		}

		static int __devexit twl6040_clk_remove(struct platform_device *pdev)
		{
		struct twl6040_clk *clkdata = dev_get_drvdata(&pdev->dev);

		clk_unregister(clkdata->clk);

		return 0;
		}

		static struct platform_driver twl6040_clk_driver = {
		.driver = {
		.name = "twl6040-clk",
		.owner = THIS_MODULE,
		},
		.probe = twl6040_clk_probe,
		.remove = __devexit_p(twl6040_clk_remove),
		};

		module_platform_driver(twl6040_clk_driver);

		MODULE_DESCRIPTION("TWL6040 clock driver for McPDM functional clock");
		MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
		MODULE_ALIAS("platform:twl6040-clk");
		MODULE_LICENSE("GPL");

Admin message